86 • Leak Testing
GX-2012 Operator’s Manual
6.
To exit Leak Check Mode and return to the Leak Check Mode Select Screen at any
time, press and hold the (SHIFT)
button for 5 seconds.
Overscale Conditions
There are three overscale conditions that the GX-2012 may experience while operating in
Leak Check Mode.
•
Exceeding display range
If you are using a display range of 500, 1000, or 2000 ppm and the gas level goes
above the display range, the full scale value of the display range will be displayed but
it will not be an overscale condition unless the gas level is above 5000 ppm.
•
Exceeding 5000 ppm
If the combustible gas level exceeds 5000 ppm, the GX-2012 will display an overscale
condition but will continue displaying the gas reading in %LEL.
•
Exceeding 100% LEL
If the combustible gas level exceeds 100% LEL, the GX-2012 will display an
overscale alarm.
NOTE:
If a vol% sensor is installed, “OVER” will still appear at the bottom of the
screen but the instrument will display the gas reading in %volume.
The GX-2012 will continue to be in overscale alarm until the gas reading decreases.
The instrument will then show readings in the LEL range until the readings decrease
back to the ppm range.
32
5000
%LEL
ppm
LEAK CK MODE
CH
4
OVER
5000
%LEL
ppm
LEAK CK MODE
CH
4
OVER
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